My buddy who is an Archaeologist tells me that they use scientific proof to find a "dig" and that if the evidence is not there to back up the "dig", then they will not get any $$, and after all, these "digs" are usually paid for by grants & endowments from Universities &/or endowment trusts & corporations. Many early civilazations did not always have much metal, so how could metal detectors find the deeply buried villages & homes many of which are from quite early in history. The metal detectors are sometimes used for finding more modern sites for "digs" and some Archaeologists turn their noses up because they feel that the "new" dig sights are not really good finds as they are too modern ( a few hundred years ago) & we know enough about those modern times, and therefore it is not what they are supposed to be finding.